Nah, I've heard this from a few different sources, including the anon who posted this on Saturday. I don't think that it's llikely to be legitimate, but it's certainly not impossible; there are definitely folks who have seen next year's 2HY catalog at this time. Regardless, I can tell you that I would be pretty surprised if we saw "masks" in any visceral, clear sense; if this guy is for real, he was almost certainly referring to axle-connection head add-ons like HF helmets or the masks that we got in the latter days of G1.
We will be seeing Harry Potter sets, but this has been confirmed pretty extensively by others.
Based on what I know about the fellow who I think is the primary source (outside of 4chan) and the style in which this is presented, I'd say that the odds are slightly below 50/50 for this one.